South Yarmouth Weather in September

September in South Yarmouth averages 23°C (73°F) during the day and 14°C (57°F) at night. Quite a bit of rainfall is typical this month, with around 96 mm (3.8 in) on average. An umbrella is a good idea.

Rainfall in South Yarmouth in September

Expect around 8 days of rain based on historical data, with 96 mm (3.8 in) average. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in South Yarmouth in September

The temperature in South Yarmouth in September is perfect. Daytime highs reach 23°C (73°F), with nights dropping to 14°C (57°F). September is a notable month of the summer season. Overall, the month follows a fairly predictable daily temperature pattern. Nights cool down to 14°C (57°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.

Sunshine in South Yarmouth in September

Expect a lot of sunshine this month, with about 231 hours of sun. These sunny conditions add to the overall experience.

So this is a great month to visit if you prefer dry days with pleasant temperatures.

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For a detailed overview over the year and the best time to visit the United States of America, check out our South Yarmouth's climate page.

South Yarmouth Temperature in September

Min Temperature 14°C (57°F)  

Max Temperature 23°C (73°F)  

Chance of Rain 27%  

Precipitation 96 mm (3.8 in)  

Rainy days 8 days  

Sunshine 231 hours *  

Percentage Sunshine *  

* Data from: Nantucket, the United States of America (43 KM, 26 Miles).

What to Wear in South Yarmouth in September

For South Yarmouth in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in South Yarmouth in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

9/10

Walking

9/10

Barbeque

8/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our South Yarmouth's climate page.

More climate data for South Yarmouth

Temperature Rainfall Sunshine

See the full South Yarmouth climate overview or explore weather in the United States of America.